The request is for a small icon to be displayed by the side of the name in the 'from' field when looking at the list of emails in the inbox. So it will show a list of names when reading down the 'from' column, but some of them will have a special icon next to them, like a ! for an important message, but more customised.

Like avatar images for email addresses if you will.

Raman, there is no functionality for this at the moment, I would expect that it's rather harder to accomplish than you may think, so you could lot a request in bugzilla and the dev team may add it in a future version, or you can get hold of the source code and try to patch it yourself.

You would need to address issues such as, where would the image be stored and how would an image be assigned to an address, would the need to be an extension coded for the admin panel etc?